Não informado. (1855). Annals of the Astronomical Observatory of Harvard College. Harvard College Observatory.
Chicagoスタイル(17版)引用形式Não informado. Annals of the Astronomical Observatory of Harvard College. Cambridge, Mass: Harvard College Observatory, 1855.
MLA(8版)引用形式Não informado. Annals of the Astronomical Observatory of Harvard College. Harvard College Observatory, 1855.
警告: この引用は必ずしも正確ではありません.